Home / 15,615.92-21,535.37-12,439.78

Finding the Fourth Proportional to 15,615.92, 21,535.37 and 12,439.78

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Solution

The fourth proportional to 15,615.92, 21,535.37 and 12,439.78 is: 17,155.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,615.92 : 21,535.37 = 12,439.78 : x
  2. Step 2: Convert to fraction form
    15,615.92/21,535.37 = 12,439.78/x
  3. Step 3: Cross multiply
    15,615.92x = 21,535.37 × 12,439.78
  4. Step 4: Simplify right side
    15,615.92x = 267,895,195.63
  5. Step 5: Solve for x
    x = 267,895,195.63/15,615.92
  6. Step 6: Final answer
    x = 17,155.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.